2 FeCl3 + 2 HI → I2 + 2 FeCl2 + 2 HCl
This is an oxidation-reduction (redox) reaction:
2 I-I - 2 e- → 2 I0 (oxidation)
2 FeIII + 2 e- → 2 FeII (reduction)
HI is a reducing agent, FeCl3 is an oxidizing agent.
Reactants:
Products:
- I2
- FeCl2 – Iron(II) chloride , Iron dichloride
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , M , Uriatic acid
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]